The days that are not in the current month used to be rendered in a ligher color. This was lost at some point. Bring it back.
c763e73 Adwaita: Bring back 'other month' coloring
gtk/theme/Adwaita/_common.scss | 2 +
gtk/theme/Adwaita/gtk-contained-dark.css | 205 +++++++++---------------------
gtk/theme/Adwaita/gtk-contained.css | 205 +++++++++---------------------
3 files changed, 124 insertions(+), 288 deletions(-)
Upstream: git.gnome.org